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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd03e0dcab7e6a54fd83b62d8908e4096f0dab7bbc3c5b795b4a92712e2adcf' 
  AND token = '9n2voUVSZQbhN+AViISQcG5+GHCiVIoKKyRxH4fqA+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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