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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b264aadc2b296558669d3b1e1a3d53bc84df4c687aabb69d5801333999a78cb' 
  AND token = 'mh6jxnF8BwVD6QcfUxy9eDHcUPTIJeS/BJ1+KyCp2NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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