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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5371ea9b38c98af0983050c5935c3bb6723b0957e3e3f5aa1085fd589d23de14' 
  AND token = 'fqTTBhm8hW7AaPvhLE8Qm5LRalPXjZnRSEeLW53onoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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