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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfc91c48e3ef7729695b387368f8a22920f2e0c627aa583cb8a264944598bb6' 
  AND token = '61609diNT64+Havdi9gZ/lNTZPaFOR4PpRye5GmuDi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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