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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbc8bd68233fd5f29aac237817bb6c22555690a9f68b2a8983d95b03421d76f' 
  AND token = 'uNRqJedqA0fWo78P0PQaPAszS9Y110tjnaz2s1lWgBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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