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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491e80ce3f40d1971f8cea27a296314ac7a75773eb982e8c4227fe73ba3097d6' 
  AND token = 'owLP0k0i4J1rMKgM87kZL/IHNFVbM3WmmVkUYvEvj0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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