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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26341a4751c70c46a016f4b0cc02e45d43edbd39733cead236e58fa37f891ff' 
  AND token = '2D5E/X7VKTDqL3jIF5PcP1KR2yJz4Z8bRifNmkY6U7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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