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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d2fb834f01139d6af6f529ab0f7cf63b28d6bae4f0903cd8489cd3c8248744' 
  AND token = '6H7+SDyV/OyGoa9iIiLJRmALUBU5InNmBzze9jjJV8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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