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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05173669c0449c23dd78e3191b4382c0de9cabc5bfe3ff109fd2fcc9b783003a' 
  AND token = '9Satfedh6yC6xS2pENTCdKmxAQMXUDS6xjWrPSodHfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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