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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73ddc70c650a203599830f001a330faeed42baf9474def4469115707be9579d' 
  AND token = 'g+017YS2vq4eSByPA42c8VPZ6nDGmHjPquCQP91FnYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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