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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f407dd05f5b70d1021b3389f838656cbb885856842fceb2e00ec3d6ba0a53d' 
  AND token = 'wfHCMK8/s5vZPoY2Mk7siXqZ1iGMj/kLkUu4WwUC7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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