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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407c774059e45f3bd558729b36c58362b520590eb79977140c7f17f8f2d47db6' 
  AND token = 'dWkG3UTwony3O5Oop4iI4MdS6tRL9v+tVqCVnl0b7nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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