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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a0d4a84d1906ef8a943a78acce8bd1da2da7dab703cc62c21f6997454b4d0d' 
  AND token = 'Oi08j5hFfHeVMcdKBTKQqYpBs4u/AAWgYsZoKs60OSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}