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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799fe3ef4c97b309e3c64829e4e7c5a90e1bd26142bb9c0edec27b50a5fe7bc9' 
  AND token = 'D6rVoHNRI3DqSjYGyonjytdoYrHfM24suuVkPuH8Tvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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