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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ab315d1229ac5da2e38f9702a5fa4c5a488c2283d3153960918ad16f79ec20' 
  AND token = 'ZipGigHtFtOlGzdwImYgRQrU0RFR7/7Fat1whhGsQOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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