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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29051ecb28979f060c7a712450e398fb03eaa9228b0bebbf4168595f122c3609' 
  AND token = 'S/gpE+X/THOO7jZa+X7GxDhmE8ZPswDE4HkxcuQ4FJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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