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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daceec4eb3df336ec352e9155ecf6f716189b6dfaa6ab4f3dcc641da94d04517' 
  AND token = 'aXgO8H0l405OlEX9TtxqnJ1gsHITgY889W0yxW+y9SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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