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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103f9f21a445c2cf3e0e5d9fc2fd575308ddb31de03d7d6d98a3639ca36a366e' 
  AND token = 'H5Z6FMoKQomK8CAQgs6uKs29NMWRRS9dg0FZV3p7xw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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