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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb786f1a16e4d3b6652894676df2c8593c718a83c182920c9c7b9cedef6b95d' 
  AND token = 'U4ZELnRKUR7FHMUv/xJx8A6uk3VOr3ZvGb9B2A9bcYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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