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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5a3c5af01f6c45110e0a9a4cea3aa699ff8b8e002a83a165ae45a1d07f7bb7' 
  AND token = 'ZHMgLxrLbxW3CEz+x6pTtALJQFAzvu1uGunDvG/yGcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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