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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095028fc749de894faf77180544b689500a141f8beb76947c9f15c7aa734d7e7' 
  AND token = '/NLLDbyrWsA39OlVDXHzmtA7ZQa9+6ajuIm6Ixu2+1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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