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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad03a5f68b9b06eb61b8d326d6eb13ebf79076cd5eb1c5f4ca0a6415c2ac8c8b' 
  AND token = '5FRTFgP6EU4TvDWHEglgZLCRHNUy+9jQ+I5hO437Rmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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