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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebf77e3d0cddf0ac1841beb495efa1d7210de3449fcdab7e41c8d9b2a0dbff2' 
  AND token = 'oq2v00fu7BTvBKxyYgXIZ/PKqi2912o2d0PpdCaGQ78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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