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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8b235cbceb707b54d08080dff005023a1e36222fa3a75577d9136ecd65ae40' 
  AND token = 'gL+B3Tu1fXVEVw9Zq9SajkwZDVUrz/FELl31Aue0j2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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