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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f62c9d61b28ec70964897e51580098cc672fde87a4681c0b9d9044755939956' 
  AND token = 'KHn1gTbjWuGkDXie42ktmNnjYMpiSkWp4x7LgZKPdPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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