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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd66f81f14d39c544fc6c72f4a6a6a48993759d1c76b1c4633cd255608723a27' 
  AND token = 'i+qEhA1fqEA25UW1yiqsvArFvJ8FmC00vM/3Vs9+Ur8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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