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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6016a71d6b3113effb77d88570b7adb83485f0ae957310ff65ec5cafac334d88' 
  AND token = 'y9KmvZt9k34R7HUMfjpZXc1+XBwiisQ8pzE15L+VsKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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