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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee627f00884caad45ddffbf5b3e06919b83207315e9f21ba7d31ac3795708e3' 
  AND token = '50aManljEs2l75V9xc/9Gbedt53LtrvgGS014MgjkCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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