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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70441b17053f9303721143abcdfb8595fd4cd28c3096e2b3ec63a55349c31bbf' 
  AND token = 'drvYNk5MtMICkxQnsMPZI8DNX0HE5JgRufqzbiubGBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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