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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cdb82641a51c36ed0d03665516304719776b67b56c5bd6be7e3d937ee1fbab' 
  AND token = 'ckPtd1Rcj5jPKZ8b3tvhVdooyj7vnuwmS5iYQ3lTGEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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