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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0d3ad893e657d8d63d4583497175116f6ba81989d7cb912a2cd8cb0dc38d68' 
  AND token = 'vqOmW0LuAV1uujsv010lA/gxNp0V9Ueo+1ClIJIHLlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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