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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca8b8bca8c13586682ff8d34f097273ac897d1c411a8bd67b4ba141d74808e7' 
  AND token = 'RJQNzpcjEsb/aLkNBTyPkoiH9rqTP5O6/y1YMdabCqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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