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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55026b185445ff2a437d0683ea8ef72f774945da2d6d52ee895b0b93f8b783c' 
  AND token = 'YOP3AcBH9/um/M86riJMFDUdtiZYXOcWQgcMPLodh1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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