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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11c3f8abf4648cbb76ab4973da0ca83e670119332b4ec449f54e7a76182ec66' 
  AND token = 'Vo1PMRbp3pz2ztBOiDk6JZRFJEijy8zpYr/B74s4Pkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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