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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4922279118e2c2571197313989ddb815f43ac1d0cb31ffd973db39171b155bc' 
  AND token = '1fAt1TED5LaRlyq5gxQFAX5+BvmnI+/i+DgX1uMLLEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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