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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a34ea746e3f91c17d6eec7a615dbedd9108ade11f276ff964b8491d70c623d' 
  AND token = 'CsPiO4D97r1XUO8GzFxiJrU9GHv+Eo4mk5tov+2L8Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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