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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851d62ee12abad4b129df347dfc32ebac63b4ea4d4d633601e2b659d616a61a4' 
  AND token = '9gfVqi2SSSgVrOY4id4MxHyMELo9kcAl3fpn9FmKUXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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