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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65028d5ca505e9e97f67640c8e26ff7d91f070545f8a8cf8a6927c5f6ee18530' 
  AND token = 't9TXXbKzxHTMKcEgB6OWBeo+marw6qcHWC0eTAFcy7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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