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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe05300d88f161958b2b11458d39ee2771dd73fa91d6a3d0132cbfb6cfbcd58' 
  AND token = 'OaOsVCsOu200jxASmyJLRpYHZUIYjdgq5semAm/aqOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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