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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13615f0cfdbe7d695ab066a5629652a4cd0156d391991991f98f288b6c6c45d' 
  AND token = 'py55LwLGGuBfHB+dyUl6yZ2al2BBasRM/HJX3y3GTkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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