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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d21186b34b12b817b5eb4a5ae3a6576e05d2dfcd75aa05628ff6b9625c58b6' 
  AND token = 'kpPDOaHW5kZRoJzVR/AuJdTRwrONOKaqm5D4g90d05s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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