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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a1e6c120acca476bd3881b9cde7c3f0ffd909794f0e634788aa51a468f3aa7' 
  AND token = '03fRl9y9nUMohB1M56fYFdkMql5sBQAkH7aTUosfIec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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