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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5937dafc5a4943c3a939e9a5ddb15e66cc32eff79774c97554ab325de5fbec3c' 
  AND token = 'Kntq4bfesnZGMopPO418Xyb7l/E8dIw0W2CFKSS7EMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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