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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcfeafc739e50693e3611f528595b0e1c6840328a8e6faeefd53b62a5253685' 
  AND token = 'LouG6rZUqzBw6Ez+rMSBu9BQW5VMSLlYF40l3rvFJB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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