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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce76b08c750c0cd9fdcac165e97f353957b1a92400f694ea22ece9adf5ffcbd' 
  AND token = '2Oat+PFFnNnSMxrPjT5ThtJRtxKNDEIHTCjyvkDNSVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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