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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df07670f860d40822bc63221c3aaac1a46198c1d7ee020fd137a9e2df32fe65d' 
  AND token = 'Q7wcWmJEaIFXtDm8JbkX5kAbmzDYZ7JlHVTMDelb4DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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