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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4d29d7c969746255d01a9d66465c962d629e674baeed598e72479c7adabfd3' 
  AND token = 'i6hRnDzBq0Yb91m2mYgP/dWW1vl5jCYqQkLWSRmH09U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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