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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9a474a19d8a23120495e512daae4e9f8f618255f14b5ddbacfa9b2fc70c18b' 
  AND token = 'bzQJ78cEXbY/zMT3VLDLXlPmOCEYSKA2m5xpdLirbSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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