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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a113cc1a18a24f1b98433ffec09a963c0d2759dc1e538ac7ab2289d920eaff' 
  AND token = 'xGCc6ZC1c1+p8wnK+olnzUtPEQyFDcBRlIQpZW4i1nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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