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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c91a085eb9df2587a6cfa02b56601999f411724e2c267ecfbeea729006dffd9' 
  AND token = 'QBObNNu6p5d7/EHp5uDI7q7o2tUGKDTshmRE626ydP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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