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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8033ae542d5dba4682d165970d85f2075c72456388082682d43d0f0a8d4ac44' 
  AND token = 'x8n3tr0sKg7BtW7i4lvEPa8iitJYsnsRU/MAMYmJ7zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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