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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe3bea3be4a47fc5ee1c25afd3a9b9460f653f6e40a3901e1f471e8ad5d5909' 
  AND token = 'mheOxzM+a6eDJeUr3vngh5qN3MChsWZydWijHDe+EUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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