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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c65404f328d07ec9b9387df4f7add585ad68477ca03f9c96e052e45913f0f76' 
  AND token = 'TdPeR46IMNFqB5+Q6ti/lYWdyc4YcrmO9XrCVIO3PH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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