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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f55c0e2b6798ee88f161a7696741a69151e7660dec8e94ee5d832d9bae3eec' 
  AND token = 'jjyBAtRGB6qtS8SOzT7uFk1sQ6RfMFxA9L2qqWSjtiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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