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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feba37467ee7fc916321d1e6b056759c2419353bff22ea64eab9b21502023163' 
  AND token = '3polpKBFlf/NOS4vUnfvxoolOLThOeakN1QSmTnSDYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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