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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135344a510b7d1444e86b0c470d5ad8107d77b481742770c5a8fba63366f733a' 
  AND token = 'FQGDTaiuNUIW6SXfi5VYJwzyAe6/EW9g98JNJqVC+Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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