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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975c674f50ec486f4d387eeca498bbaaa39b4939e94f9b9c4c25085fcf0dad9f' 
  AND token = 'nU4IXefHqwk99XvrxEO/ur+Viyo8EW9ziv2wTSBLEpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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