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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c0159db5db5ee8e10c79571c801f4f4f304a0c43faaecda7511a35bd2baa9b' 
  AND token = '60k/2DQP5Y2QlLT+6AJ0rQrtYYDbFunCapf667EDEvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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